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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net cash provided by (used in) operating activities $ 292,992 $ 156,073
Cash flows from investing activities:    
Proceeds from sale of property and equipment 12 92
Purchases of property and equipment (2,204) (4,815)
Purchases of equity securities (18,431) (2,180)
Purchases of available-for-sale debt securities (210,052) (253,650)
Proceeds from sales of equity securities 3,446 10,952
Proceeds from sales of available-for-sale debt securities 25,476 7,530
Proceeds from sale of private equity limited partnership 11,463 0
Maturities of available-for-sale debt securities 89,778 57,735
Net cash provided by (used in) investing activities (100,512) (184,336)
Cash flows from financing activities:    
Preferred stock dividend (5) (5)
Common stock dividend (9,356) (9,276)
Purchase of treasury stock inclusive of excise taxes paid (7,427) (9,763)
Payments related to tax withholding for share-based compensation (1,290) 0
Repayment of debt (735) (735)
Net cash provided by (used in) financing activities (18,813) (19,779)
Cash and cash equivalents and restricted cash and cash equivalents:    
Net increase (decrease) during the period 173,667 (48,042)
Balance, beginning of period 262,076 399,941
Balance, end of period $ 435,743 $ 351,899